mirror of https://github.com/kepler155c/opus
51 lines
944 B
Lua
51 lines
944 B
Lua
local Util = require('opus.util')
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local History = { }
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local History_mt = { __index = History }
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function History.load(filename, limit)
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local self = setmetatable({
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limit = limit,
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filename = filename,
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}, History_mt)
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self.entries = Util.readLines(filename) or { }
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self.pos = #self.entries + 1
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return self
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end
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function History:add(line)
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if line ~= self.entries[#self.entries] then
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table.insert(self.entries, line)
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if self.limit then
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while #self.entries > self.limit do
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table.remove(self.entries, 1)
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end
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end
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Util.writeLines(self.filename, self.entries)
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self.pos = #self.entries + 1
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end
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end
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function History:reset()
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self.pos = #self.entries + 1
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end
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function History:back()
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if self.pos > 1 then
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self.pos = self.pos - 1
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return self.entries[self.pos]
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end
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end
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function History:forward()
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if self.pos <= #self.entries then
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self.pos = self.pos + 1
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return self.entries[self.pos]
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end
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end
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return History
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